Gas appliance



May 19, 1931. A. .1, MILLIGAN GAS lAPPLIANCE Filed Feb. 18, 1929 NVENTOR. 1 J j' d@ N M6135/ fwn/Jj Patented May 19., 1931 PATENT vorricla:

ALBERT J. MILLIGAN, y(3F SAN FRANCISCO, CALIIEORN/11Ay Gas APPLIANCE Application led February 18, 192,9.A Serial No. 340,952.

This invention relates to improvements in gas appliances and more particularly to gas saving attachments to gas burners.

Among the objects of the invention are to insure efficient use of the gas burner, by automatically shutting olf the gas supply when the burner is not in use and automatically turning on the gas and igniting the burner when heat is desired, in combination with manual control and regula-tion ofthe gas supply to the burner.

Another object is to conserve the time of cooks, more especially in restaurants, where much time is lost in regulating the. gas for different kinds of fry orders requiring dif -ferent volumes of heat.-` Other objects and advantages will appear as this description progresses.

Nith this invention .applied to several .i 9 the valve has a transverse cylindrical bod7 e 70 Y burners, the burner adjusted to the desired volume can be chosen and the utensil set upon it without further attention until the food is cooked. One of the advantages of this invention is lowering the temperature in small kitchens during the rush hours, since only those burners actually Vused forv cooking are ignited. It isk an established fact that few cooks willturn off a. burner f after they are through with it, accounting for 3o waste heat often as high as 50% over that required in actual cooking.

In this specification and the annexed drawying theinvention is illustrated in the form considered the best, but it is to be underv stood that it is not limited to such form, be-

cause it maybe embodied in other forms,

and it is also to be understood that in and by the claims following the description` it is desired to cover the invention in whatsoever 40 form itymay be embodied.

In the accompanying one sheet of drawings Fig. 1 is a side elevation of a gas stove partly in vertical section, having this invention applied to the burner thereof.

Fig. 2 is an enlarged detail in side elevation partly in vertical section, of the comn bined automatic and manualV control valve Vforming part of this invention.

f Fig. 3isan end view of the same partly in Fig. 1'.

cross-section to illustrate the pilot light reg- Y ulating valve. I'

In detail the construction illustrated in the drawings, referring to Fig. 1, comprises the stove top 1, supported upon the vertical walls 2 in the usual manner, with the open grid 3 over the burner. The burner comprises the mixing chamber 1, the throat 5 and the aspirator 6. Theburner mixing chamber is spaced beneath the-grid 3 and sup- 60 ported on the transverse bar 7 at the rear. The aspirator 6 is provided with they usualv center hole engaging the nozzle 8 of the serv? ice cock having the nipple 9 that is screwed into the service pipe 10. This combination (55` comprises the conventional gas shelf or gas stove top, to any type of which this inven-V tion is applicable. l

Intermediate the nozzle 8 and the nipple .11. This body is drilled to receive the sliding plunger 12 which acts as a valve closing" the longitudinal bore .13 throughv the nozzle and the stem 9.V To reduce friction onthe flowing gas and increase its volume the bore 13 is counter-bored at 14, from the end of the nipple 9 up to near the plunger 12.

This plunger extends upward flush with the top of the lug 15 of the body and is surmounted by the over-hanging washer 16 se- 80 cured by the screw 17 threaded into the end of the plunger, see Fig. 2. The plunger extends through the lower lug18 of the body and is provided with the adjustable collar 19 fixed thereon by the set screw 20. i j

Thevexpansive spring 21 is introduced between the collar 19 and the endv of the lug 18, whereby the washer 10 normally is held against the top ofthe lug 15 and the gas mailitained in the shut-off' position as shown in 90 This plunger is provided with an annular groove or passage 22 adapted to be brought into registry ywith the longitudinal hole 13 to permit a free flow of gas through the nozzle when the plunger is elevated to the 1 position shown in Fig. 2. A hole through the plunger 12 would serve the same purpose as the groove 22, but would require means to insure registry with the hole 14.

The automatic control vof the valve consists 10o (lil of the lever 26 on the i'ulcrum 25 will raise.

and lower the plunger 12.

The inner end of the lever 26 is provided with the adjustable clamp 29, secured by a screw through the lever 2G, to lock the clamp at any desired position on the lever 26 in the adjustment holes 30.

The vertical trip stem 31 is set in the clamp by the set screw 32, and is adjustable as to height and angle by the screw The upper en d 33 ot this trip is adj usted to project slightly above the grid 3 so that when depressed flush with the top thereof the opposite end ot the lever 26 will lift the plunger to bring the groove 22 into registry with the longitudinal hole 13 through the valve, permitting the maximum flow ot' gas from the service pipe 10. The tension of the spring 21 is such that the weight of a light utensil placed upon the grid 3 will depress the trip 33 as described.

To manually regulate the desired flow of gas fronithe service pipe to the valve, l

provide the operating handle 34 iixed to the top of a hollow sleeve 36, threaded on the lug otI the valve, whereby the rotation of the handle 34 upward permits the plunger l2 to rise to the extent that the handle is turned, thus giving a manual control of the volume of gas passing through the valve independent of the automatic control of the valve through the trip 33 and assembled mechanisn'i.

The admission of air to the aspirator G is controlled by the usual louver 37 rotatable upon the nozzle 8. Adjustment of the louver is fixed by the set screw 3S passing through a segmental slot in the louver and 'threaded into the diaphragm of the aspirator trout, in

th e usual manner.

rthe pilot light Jfor igniting the burner comprises the small tube 39 iii-Led into a transverse hole passing through the side of the valve body 11 and communicating with the longitudinal counter bore 1-1- intermediate the service pipe 10 and the valve plunger 12, so that gas service to the pilot is independent of the valve control to the gas burner.

A vertical pilot valve plug is closely fitted into a vertical hole in the body 11. rlhis plug is provided Tith a transverse valve hole 40 adapted to register with the transverse hole into they bore 14. The upper end ot this pilot! valve is bent to ormthe handle 41..

The outer end oi" the pilot 39 is brought into proximityto the burner mixing chamber Ll from which the flame emerges yand is adapted to light the burner when the gas iiow is admitted-thereto through the nozzle 8. The

`amountofthe-'flame issuing 'from the pilot may be regulated by the manual adjustment 41. Pilot lights, not ot' the Bunsen type, burn with a yellow flame which blackens the ritensils which it contacts. Such pilots also become encrusted at the tip which eventually closes. This difficulty is overcome by forming the stricture 39 near the end. rlfhis stricture iorms a chamber near the choked tip of the pilot which becomes heated by the pilot flame and from the adjacent burner 4l, forming in effect a. retort within which the gas is regenerated so that the issuing therefrom burns clean and blue as a Bunsen flame.

Where the mixing chamber -l of the burner has a center opening the trip 33 is preferably extended upwardly therethrough as in Fig. 1.

This invention operates substantially as follows: rlhe pilot light 39 is ignited to throw a flame across the top ot the mixing chamber e, as regulated by the pilot valve al. When the stove is 'to be used, the handle 3e is turned into the position shown in Fig. 2 which lets the plunger 12 rise to the maximum height and permits the gas to flow past the annular groove 22 and through the longitudinal opening 13 in the nozzle S and into the throat 5 of the burner. The aspirating effect of the issuing gas draws air through the louver 37, the mixture passing into the mixing chamber l from whence it issues through the jets of the burner, being ignited by the pilot llame from 39, when there is a utensil resting on the top of the trip 33.

When the utensil is lifted or removed the ex iansion of the s rino' 21 1forces the lunOer v downward moving the annular groove 22 out of registry with the hole 13,v shutting o the gas completely. When the utensil is replaced the operation is reversed and the full flow of gas again passes through the burner to be again ignited by the pilot, the amount of gas being regulated by turning the handle 34. To regulate the rise of the plunger 12, the washer 16 fixed onthe upper end thereot` impacts against the top of the opening within the adjustable hollow sleeve 36.

Flat utensils with handles, such as 'fry pans, do not rest level on the grid 3 due to the over balance of the handles, and would not therefore turn the gas full on. This is corrected by the extension 3300,011 the trip which catches the utensil oli" center and fully depresses the trip. l

Having thus described this invention what I claim and desire to secuie by Letters Patent is:

1. In combination with a gas stove adapted to supporta utensil; a gas burner; a service valve having a longitudinal hole therethrough and a transverse plunger slidable in y said valve and having a passage registera-ble with said hole; automatic means operated by said utensil tor operating said plunger, and manual means for operating saidplunger.

2. In combination with a stove adapted to support a utensil; a gas burner; a service valve having a hole therethrough and a transverse plunger slidablein said valve and having a passage therein; a spring and stop 5 adapted to normally hold said passage and hole out of registry; a lever pivoted on said stove having one end engaging said plunger and the otherv engaging said utensil and a pilot tube extending from said valve to said 10 burner and having a nozzle end and a chamber in said tube adjacent said end.

3. In combination With a gas stove adapted to support a utensil; a gas burner; a service Valve having a hole therethrough and a trans- 35 verse plunger slidable in said valve and having a passage therein; a spring and stop adapted to normally hold said passage and hole out of registry; a lever pivoted on said stove having one end engaging said plunger 20 and the other engaging said utensil and a handle screwed on said valve engaging the n end of said plunger.

In testimony whereof I have hereunto affixed my signature.

2s ALBERT J. MILLIGAN. 

